Electromagnetic brakes (also called electro-mechanical brakes or EM brakes) slow or stop motion using electromagnetic force to apply mechanical resistance (friction). They were originally called "electro-mechanical brakes," but over the years the name changed to "electromagnetic brakes", referring to their actuation method!} Wikipedia said; The principle of braking involves the conversion of kinetic energy into thermal energy. When activating the brakes, a stopping force several times as powerful as the force that puts the car or vehicle in motion is activated and dissipates the associated kinetic energy as heat. Brakes arrest the speed in a short period regardless of how fast the vehicle is going. An electromagnetic brake uses an electric actuation but transmits torque mechanically.